Fire alarm and spray system actuated by melting a soluble nylon strand

Claim 1

IN A FIRE ALARM AND SPRAY SYSTEM INCLUDING A WATER SUPPLY VALVE, A VALVE ACTUATING PLUNGER AND A NORMALLY HORIZONTAL WEIGHTED ARM PIVOTALLY SUPPORTED AT ONE END ADJACENT SAID PLUNGER AND OPERABLE BY GRAVITY TO MOVE SAID PLUNGER TO OPEN SAID VALVE, A HOUSING ADJACENT THE OTHER END OF SAID ARM, A PAIR OF HORIZONTAL SPACED APART POSTS IN SAID HOUSING, AN ARM SUPPORT MEMBER PIVOTALLY MOUNTED IN SAID HOUSING BELOW SAID ARM AND BETWEEN SAID POSTS, A PLASTIC HEAT SOLUBLE STRAND HAVING ITS ENDS SECURED TO SAID POSTS AND AN INTERMEDIATE PORTION EXTENDING BENEATH AND SUPPORTING SAID ARM SUPPORT MEMBER AND HENCE SAID ARM, A SWITCH ACTUATING LEVER PIVOTALLY MOUNTED AT ONE END IN SAID HOUSING ABOVE SAID ARM SUPPORT MEMBER, A SECOND PLUNGER EXTENDING BETWEEN AID SWITCH LEVER AND SAID ARM SUPPORT MEMBER, SPRING MEANS BIASING SAID SWITCH LEVER DOWNWARDLY AGAINST SAID SECOND PLUNGER, AN ELECTRICAL CONTACT CARRIED BY THE OTHER END OF SAID SWITCH ARM, AND A FIXED CONTACT CARRIED INTERNALLY OF SAID HOUSING ADJACENT SAID FIRST CONTACT AND IN THE DOWNWARD PATH OF TRAVEL OF SAID FIRST MENTIONED CONTACT, CLOSURE OF SAID CONTACTS BEING ADAPTED TO CLOSE CIRCUIT TO ACTUATE AN ALARM, MELTING OF SAID STRAND DUE TO EXCESS HEAT RELEASING SAID ARM TO FALL BY GRAVITY TO OPEN SAID VALVE, AND PERMITTING SAID SPRING MEANS TO BIAS SAID SWITCH LEVER DOWNWARDLY TO ENGAGE SAID FIRST MENTIONED CONTACT WITH SAID FIXED CONTACT TO ACTUATE THE ALARM SIMULTANEOUSLY WITH THE OPENING OF THE VALVE.